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how did you size it miho? from the drawing or?

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Eight inch guns is a bit of an odd one to me. I can sort of kind of see the idea of a sizable 6" battery for something like a commerce raider, but if you've got no armor at all, you don't really want to be mixing it up with an opponent that requires an 8" battery.

Everybody had cruiser-sub ideas, though, so there must have been some merit to the concept.

Some further info on the Tauhschiffe
http://dreadnoughtproject.org/plans/SM_Projekt_50_1918/
Apparently they actually ordered one.

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Source Materiel is always welcome.

under the keel. it stands 212. if it's in feet or meters is difficult to say.

Those are frame numbers, not length.

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Source Materiel is always welcome.

EDIT: Oops, I might be wrong. Those are not meter measurements. She's closer to just over 100 meters.

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We might size based on the torpedoes shown aboard. If we presume them to be the 50cm G7, a popular WW1 unit of 7m overall length, we arrive at about 0.6m per frame. This would suggest a length of about 130m.

Well, If everyone is running the subs under old cruiser rules for shipping interdiction then having surface guns makes sense - a shell is a lot less expensive than a gun, and if you have to surface to check the ship for war material anyway, then it makes sense to have the guns.

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The exact length of UD 1 aka Projekt 50 was 125.80 meters.

Except that you don't need nine 8" guns to go commerce raiding. A pair of 5" guns would be more than enough to sink an unarmored, unarmed merchant ship. Once you factor in the cost of designing a submarine to mount some of these guns and their turrets I doubt you'd ever save any money over just torpedoing everything. Never mind the engineering challenges of trying to make something like that submersible.

There's a reason cruiser submarines fell out of favor so quickly; everyone realized they were a really, really stupid idea.